AUTHOR=Hammad Moshira I. , Conrads Georg , Abdelbary Mohamed M. H. 

TITLE=Isolation, identification, and significance of salivary Veillonella spp., Prevotella spp., and Prevotella salivae in patients with inflammatory bowel disease

JOURNAL=Frontiers in Cellular and Infection Microbiology

VOLUME=13

YEAR=2023

URL=https://www.frontiersin.org/journals/cellular-and-infection-microbiology/articles/10.3389/fcimb.2023.1278582

DOI=10.3389/fcimb.2023.1278582

ISSN=2235-2988

ABSTRACT=<p>The global prevalence of inflammatory bowel disease (IBD) is on the rise, prompting significant attention from researchers worldwide. IBD entails chronic inflammatory disorders of the intestinal tract, characterized by alternating flares and remissions. Through high-throughput sequencing, numerous studies have unveiled a potential microbial signature for IBD patients showing intestinal enrichment of oral-associated bacteria. Simultaneously, the oral microbiome can be perturbed by intestinal inflammation. Our prior investigation, based on 16S rRNA amplicon sequencing, underscored elevated abundance of <italic>Veillonella</italic> spp. and <italic>Prevotella</italic> spp. in the salivary microbiomes of IBD patients. Noteworthy, <italic>Prevotella salivae</italic> emerged as a distinct species significantly associated with IBD. <italic>P. salivae</italic> is an under-recognized pathogen that was found to play a role in both oral and systemic diseases. In this study, we delve deeper into the salivary microbiomes of both IBD patients and healthy controls. Employing diverse cultivation techniques and real-time quantitative polymerase chain reactions (RT-qPCR), we gauged the prevalence and abundance of <italic>Veillonella</italic> spp., <italic>Prevotella</italic> spp., and <italic>P. salivae</italic>. Our isolation efforts yielded 407 and 168 strains of <italic>Veillonella</italic> spp., as well as 173 and 90 strains of <italic>Prevotella</italic> spp., from the saliva samples of IBD patients and healthy controls, respectively. Veillonella-vancomycin agar emerged as the discerning choice for optimal <italic>Veillonella</italic> spp. cultivation, while Schaedler kanamycin-vancomycin agar proved to be the most suitable medium for cultivating <italic>Prevotella</italic> spp. strains. Comparing our RT-qPCR findings to the previous 16S rRNA amplicon sequencing data, the results corroborated the higher abundance of <italic>Veillonella</italic> spp., <italic>Prevotella</italic> spp., and <italic>P. salivae</italic> in the saliva of IBD patients compared to healthy controls. However, it’s worth noting that in contrast to RT-qPCR, the 16S rRNA amplicon sequencing data revealed greater absolute abundance of all three bacterial groups in both IBD patients and controls.</p>